This circuit was found in Motorola documentation from 1968. SCRs can be modern equivalents and the maximum load is 5 A at 40 V.
TDK provides a wide range of EPCOS varistors for surge protection through Mouser Electronics....
This circuit is indicated for the analysis of TTL circuits, being powered by 5 V taken from the...
This circuit was obtained from a Philips documentation from 1970. It can be built on modern...